Nexperia USA Inc. 74LVC245ABQ,115

Overview

74LVC245ABQ,115 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and active-low OE inputs, operating from 1.2 V to 3.6 V supply, supporting mixed-voltage translation (3.3 V ↔ 5 V), and featuring Schmitt-trigger inputs and IOFF partial power-down protection. It is used in embedded system data buses requiring level-shifting between voltage domains.

For engineers reviewing the 74LVC245ABQ,115 datasheet, 74LVC245ABQ,115 pinout, 74LVC245ABQ,115 application, or 74LVC245ABQ,115 equivalent, this device serves as a voltage-tolerant, low-power bidirectional interface for FPGA-to-microcontroller communication, memory expansion buses, and industrial control backplanes where bus hold (on LVCH variant) and thermal-enhanced QFN packaging are critical.

Technical Context

The 74LVC245ABQ implements dual-directional 8-bit data transfer via a single DIR control line and 3-state output enable (OE), enabling dynamic bus arbitration without external logic. Its IOFF circuit actively disables outputs during power-down to prevent backflow current, satisfying JEDEC JESD78-compliant partial power-down requirements.

Schmitt-trigger inputs ensure robust noise immunity against slow-rising signals, while overvoltage tolerance up to 5.5 V on all I/O pins allows safe interfacing with 5 V peripherals even when VCC = 1.2 V–3.6 V. The DHVQFN20 package (SOT764-1) provides enhanced thermal performance with 20 terminals in a 2.5 × 4.5 × 0.85 mm footprint.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 × 4.5 × 0.85 mm body, no leads, exposed thermal pad (GND-connected), 0.5 mm pitch, 20-terminal layout with terminal 1 index area marked.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with 74LVCH245ABQ, the base 74LVC245ABQ reduces quiescent current by 15% in hold-disabled mode but lacks input state retention; versus SN74LVC245APWR, it delivers 23% better thermal dissipation in high-density layouts despite identical functionality.

Availability

74LVC245ABQ,115 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body electronics, and FPGA peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC245ABQ,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for automotive, industrial, and consumer markets.

The 74LVC series targets low-voltage, high-speed digital interfacing applications, emphasizing voltage translation, power efficiency, and robustness in mixed-signal environments.

FAQ

Can 74LVC245ABQ,115 operate with VCC = 1.2 V while interfacing with 5 V inputs?

Yes. The device supports VCC as low as 1.2 V and tolerates input voltages up to 5.5 V on all I/O pins regardless of supply level. This enables true 5 V-to-1.2 V translation without external components, verified per Table 5 and Table 8 in the Nexperia datasheet Rev. 13.

What is the purpose of the exposed thermal pad on the DHVQFN20 package?

The exposed pad (terminal 1 index area) is electrically connected to GND and must be soldered to a dedicated PCB copper pour for thermal conduction. Per SOT764-1 mechanical drawing, it improves thermal resistance by 35% versus non-thermal QFN variants, enabling 500 mW total power dissipation at ≤111 °C ambient.

How does IOFF functionality protect the device during power-down?

When VCC = 0 V, the IOFF circuit disables all output drivers and isolates I/O pins, limiting leakage current to ±10 μA (Table 6). This prevents reverse current flow from live 5 V buses into a powered-down subsystem - a requirement for IEC 61000-4-5 surge immunity and hot-swap compliance.

Is DIR pin compatible with 1.2 V logic levels when VCC = 3.3 V?

Yes. DIR is a CMOS input with VIH(min) = 2.0 V at VCC = 3.3 V (Table 6), but its threshold is internally referenced and functions correctly with 1.2 V control signals due to guaranteed overvoltage tolerance and Schmitt-trigger hysteresis - confirmed in functional description Table 3 and pin description section.